package com.matei.eece411.A2;


import java.awt.*;
import java.awt.event.*;
import java.rmi.Remote;
import java.rmi.registry.LocateRegistry;
import java.rmi.registry.Registry;

import javax.swing.*;



public class GUI extends JPanel implements ActionListener {
    protected JTextField textField;
    protected JTextArea textArea;
    private final static String newline = "\n";

    static GUI gui;
    MessageQueue _queue = null;
    MessageCallback userCallback = null;
    ServerInterface chatServer;
    boolean firstMessage = true;
    
    Registry registry;
    String serverAddress="128.189.238.54";
    String serverPort="3232";

    
    public GUI() {
        super(new GridBagLayout());

        textField = new JTextField(50);
        textField.addActionListener(this);

        textArea = new JTextArea(20, 50);
        textArea.setEditable(false);
        JScrollPane scrollPane = new JScrollPane(textArea,
                                   JScrollPane.VERTICAL_SCROLLBAR_ALWAYS,
                                   JScrollPane.HORIZONTAL_SCROLLBAR_ALWAYS);

        //Add Components to this panel.
        GridBagConstraints c = new GridBagConstraints();
        c.gridwidth = GridBagConstraints.REMAINDER;

        c.fill = GridBagConstraints.HORIZONTAL;
        add(textField, c);

        c.fill = GridBagConstraints.BOTH;
        c.weightx = 1.0;
        c.weighty = 1.0;
        add(scrollPane, c);
    }

    
    public void actionPerformed(ActionEvent evt) {
        String text = textField.getText();
        _queue.enqueue(text);
        try {
 		      chatServer.talk(userCallback, text);
 	   }
 	   catch (Exception ie) {
 		  textArea.append("Failed to send message.");
 	   }
        // makes for nicer UI to help the user overwrite old message
        textField.selectAll();
    }
    
    
    public void addToTextArea (String s) {
        textArea.append (s + newline);
        textArea.repaint();
        //Make sure the new text is visible, even if there
        //was a selection in the text area.
        textArea.setCaretPosition(textArea.getDocument().getLength());
    }

    /**
     * Create the GUI and show it.  For thread safety,
     * this method should be invoked from the
     * event-dispatching thread.
     */
    protected static GUI createAndShowGUI(MessageQueue q) {
        
        if (gui != null) {
            return gui;
        }
        
        //Create and set up the window.
        JFrame frame = new JFrame("TextDemo");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        //Create and set up the content pane.
        GUI newContentPane = new GUI();
        newContentPane.setOpaque(true); //content panes must be opaque
        frame.setContentPane(newContentPane);

        //Display the window.
        frame.pack();
        frame.setVisible(true);
        
        gui = newContentPane;
        gui._queue = q;         
        
        return gui;
    }
    
    
    public void jionChatRoom(){
    	
    	try {
            registry = LocateRegistry.getRegistry(serverAddress, (new Integer(serverPort)).intValue());
            
            // look up the remote object
            Remote remoteObject = registry.lookup("rmiServer");    		
            
			if (remoteObject instanceof ServerInterface) {
				chatServer = (ServerInterface)remoteObject;
				userCallback = new MessageCallbackImpl(this.textArea);
				userCallback.setName("Tyler Fang");
 		        chatServer.join(userCallback);
			} 
			else {
				System.out.println("Not a Chat Server.");
				System.exit(0);
			}
        }
        catch (Exception e) {
            System.out.println("RMI Lookup Exception" + e.getMessage());
            System.exit(0);
        }; 
    }
}
